Relief printing plate precursor for laser engraving, method of producing the same, relief printing plate obtainable therefrom, and method of producing relief printing plate

Abstract

A relief printing plate precursor for laser engraving, including a relief forming layer that includes a peroxide and a binder polymer, and includes a crosslinked structure.

1 . A relief printing plate precursor for laser engraving, comprising a relief forming layer that comprises a peroxide and a binder polymer, and comprises a crosslinked structure. 
   
   
       2 . The relief printing plate precursor of  claim 1 , wherein the content of the peroxide is from 0.01% to 20% by mass based on the total mass of the relief forming layer. 
   
   
       3 . The relief printing plate precursor of  claim 1 , wherein the peroxide includes at least one organic peroxide. 
   
   
       4 . The relief printing plate precursor of  claim 1 , wherein the peroxide includes at least one selected from the group consisting of a ketone peroxide, a diacyl peroxide, a dialkyl peroxide, a hydroperoxide, a peroxy ketal, a peroxy ester, and a peroxy dicarbonate. 
   
   
       5 . The relief printing plate precursor of  claim 1 , wherein the 10-hour half-life temperature of the peroxide is 100° C. or more. 
   
   
       6 . The relief printing plate precursor of  claim 1 , wherein the crosslinked structure of the relief forming layer is formed by at least light exposure or heating. 
   
   
       7 . The relief printing plate precursor of  claim 6 , wherein the crosslinked structure of the relief forming layer is formed by heating. 
   
   
       8 . The relief printing plate precursor of  claim 7 , wherein the 10-hour half-life temperature of the peroxide is higher, by 5° C. or more, than the heating temperature for forming the crosslinked structure of the relief forming layer. 
   
   
       9 . The relief printing plate precursor of  claim 1 , wherein the thickness of the relief forming layer is from 0.05 mm to 10 mm. 
   
   
       10 . The relief printing plate precursor of  claim 1 , wherein the shore A hardness of the relief forming layer is from 50° to 90°. 
   
   
       11 . A method of producing the relief printing plate precursor of  claim 1 , the method comprising:
 forming a layer of a resin composition comprising a peroxide, a binder polymer, and a crosslinking agent;   drying the layer of the resin composition; and   forming a crosslinked structure in the dried layer of the resin composition by at least light exposure or heating.   
   
   
       12 . A relief printing plate precursor for laser engraving produced by the method of  claim 11 . 
   
   
       13 . A method of producing a relief printing plate, comprising forming a relief layer by laser engraving the relief forming layer in the relief printing plate precursor of  claim 12 . 
   
   
       14 . A relief printing plate produced by the method of  claim 13 .